<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      background: #ececec;
    }
    .box {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%,-50%);
      background: #ffffff;
      width: 600px;
      box-shadow: -10px 10px 10px rgba(0,0,0, .1);
    }
    .cover_text {
      font-size: 80px;
      font-weight: 700;
      color: #939393;
      text-align: center;
    }
    .band span {
      background: #3699d5;
      color: #fff;

      width: 225px;
      font-size: 24px;
      padding: 8px 0;

      position: absolute;
      transform: rotate(45deg);
      left: -25px;
      top: 30px;
      text-align: center;
    }
    .band {
      position: absolute;
      top: -10px;
      right: -10px;
      width: 150px;
      height: 150px;
      overflow: hidden;
    }
    .band::before,
    .band::after {
      border: 5px solid #2880b8;
      content: '';
      position: absolute;
      border-top-color: transparent;
      border-right-color: transparent;

    }
    .band::after {
      bottom: 0;
      right: 0;
    }
  </style>
</head>
<body>
  <div>
    <div class="box">
      <p class="cover_text">热卖标签</p>
      <div class="band"><span>Popular</span></div>
    </div>
  </div>
</body>
</html>